Today's Top World News Story

ABUJA, Nigeria (AP) — Nigeria's aviation minister says President Goodluck Jonathan has called challenger Muhammadu Buhari to concede and congratulate him on his electoral victory. This paves the way for a peaceful transfer of power in Africa's richest and most populous nation. Learn More

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TIKRIT, Iraq (AP) — Iraqi forces battled Islamic State militants holed up in downtown Tikrit, going house to house Tuesday in search of snipers and booby traps, and the prime minister said security forces had reached the heart of the city. More »

BEIRUT (AP) — International donors at a conference in Kuwait pledged $3.8 billion Tuesday to help Syrians affected by the civil war, as U.N. officials warned of a fresh wave of mass displacement after Islamic groups took over a major city in northwestern Syria. More »

BERLIN (AP) — Lufthansa knew six years ago that the co-pilot of the passenger plane that crashed in the French Alps last week had suffered from a "serious depressive episode," the German airline said Tuesday. More »

LAUSANNE, Switzerland (AP) — Nuclear talks between Iran and six world powers will pass the negotiators' self-imposed Tuesday night deadline to produce the outline of an agreement and will be extended by at least a day, the United States said. More »

ISTANBUL (AP) — Two members of a banned leftist group and a prosecutor they held hostage inside a courthouse in Istanbul died Tuesday after a shootout between the hostage takers and police, officials said. More »

SANAA, Yemen (AP) — Yemeni military officials say Houthi rebels have taken up positions overlooking the strategic Gulf of Aden, raising the risk they could threaten the global shipping route with heavy weapons. More »

BERLIN (AP) — Heavy winds swept across Britain, Germany and the Netherlands on Tuesday, killing one man, knocking other pedestrians to their knees and forcing numerous flight and train delays and cancelations. More »